Blowpipe



J. HARRIS.

BLOWPIPE.

APPLICATION FILED JULY 10,1920.

Patented Aug. 1, 1922.

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30HN.HABRIS, 01? LAKEWOOD, OHIO, ASSIGNOR T CARBO-UXYGEN COMPANY, OF PITTSBURGH, PENNSYLVANIA, A. CORPORATION OF DELAWARE.

BLOWPIPE.

menace.

Specification of Letters Patent.

Patented Aug. 1, 11922..

To all whom it may concern:

Be it known that I, JOHN HARRIs, a citizen of the United States, residing at Lakewood, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Blowpipes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings. I

This invention relates to blowpipes such as are employed in the art of cutting with gases. It is the general object of the invention to provide a blowpipe of this type which is particularly eflicient in operation. More limited objects of the invention are to provide a blowpipe which is particularly adapted for the efiiclent combustion and use of gases having a high igniting point (suchas butane, propane, calorlne, natural gas, and commercial rock gas) and which will enable such gases. ;to be used under the varying pressures reqiiired for the commercial cutting and softening of metal and without liability of the flame being blown out by the pressure of the oxygen in the central or cutting jet orifice. the invention is to provide a blowpipe which will be capable of cutting greater thicknesses of metal or deeper-slots in metal than other pipes with which I am familiar.

I secure these results and advantages in and through the embodimentof my invention shown in the drawings wherein Fig. 1 represents a central, vertical'sectional view through the head and top of a blowpipe embodying my invention; Fig. 2 aside elevation of the inner tip member of such blowipe; and Figs. 3 and i enlarged sectional views corresponding respectively to the lines 3--3 and 4-4 of Fig. 1. I

Describing the various parts illustrated herein by reference characters, 1 denotes the head of my blowpipe, said head being provided with a neck 2 having in the upper portion thereof a branched passageway 3 communicating at its forward end with a chamber 4, an upwardly inclined passageway 5 and a second upwardly inclined passageway '6. Communicating with the rear or receiving ends of the passageways 3, 5 and 6 are the pipes 7 8 and 9 which serve to conduct cutting oxygen, preheating oxygen,

A still further object of and combustible gas respectively thereto. The upper end of the passageway 5 communlcates with a chamber 10 formed by a bore extending downwardly and forwardly into said head and having threaded therein the body 11 of an injector, the said. injector having a stem 12 mounted in said chamber and an operating head 13, there being packing 14: interposed between said head and a seat 15 on top of the head. This injector is provided with a central bore 16 the upper end of which communicates by lateral ports 17 with the chamber 10. The lower end of the injector is adapted to discharge central- 1y into'an inclined passageway 18 which in turn discharges into an annular chamber 19 provided in the lower portion of the blowpipe head and surrounding the inner tip member, to be described hereinafter. The passageway 6 discharges into 'a chamber 20 surrounding'the lower end of the said injector and communicating with the passageway 18.

Extending downwardly from the chamber 4 is a short passageway 21, which merges with an enlarged threaded bore 22 extend; ing to the chamber 19.

Threaded into the said bore 22 is an inner tip member, indicated generally at 23. This member comprising an upper threaded portion 24 cooperating with the thread in the bore 22 and provided with a rounded head 25 adapted to seat against the rounded upper end of said bore. Below the threaded projection24, the said member is provided with a cylindrical enlar ement or projection 26 adapted to fit wit in the upper end of the outer ,tip member, to be described hereinafter. The cylindrical projection 26 is provided with a plurality of slots 27 (five such slots being shown) each extending the full length of the projection and being preferably rectangular in shape. Below the projection 26, the said member is provided with a short cylindrical projection 28, the bottom of the last mentioned projection merging with the tapered or frusto conical lower end of said member, as indicated at 29. The said inner member is provided with a central bore 30 for conducting. cutting oxygen from the chamber a to the central outlet orifice 31..

Fitting within the lower end of the head 1 and surrounding the lower portion of the, inner tip member is the outer tip member, This outer member, indicated, generally at" 32, has a cylindrical upper portion 33 adapt ed to fit within the lower end of the head. and to fit snugly about the cylindrical projection 26 of the inner tip member, thus sealing the outer sides of the slots 27. For the purpose of securing the two members together, a slot 34 is provided in the inner surface of the outer member and a key 35 is inserted into this slot and into one of the slots 27, the slots providing jointly a keyway for said key. This key may be conveniently pressed into said keyway and slot, thereby to assemble the tip members, the two members being inserted in assembled condition within the head. This manner of connecting the inner end and the outer tip members has proven of great advantage in the quick and efiicient assembling of said members.

The lower portion of the outer member rovides with the inner tip member a chamber 36 which communicates with the lower ends of the slots 27 and with the upper ends of the'passa eways for preheating mixture ,formedby t e gases supplied through the passageways 5 and 6. Five such preheatmg passageways 37 are shown, are equally spaced about the central passageway 30 and are provided between the inner surface of the outer tip member and the outer surface of the inner tip member. The lower portions vantage in that it enables me to im inge the ignited preheating gases more near y upon a single spot of metal (in the line of the axis of the tip and of the discharge orifice 31 of the passageway 30) than is possible with any other blowpipe with which I am familiar; this results in a more instantaneous preheating of the metal, with a minimum consumption of gas.

The chamber 38-has been found to be of great benefit in that it enables me to employ gases of high igniting point, as pointed out ereinbefore, without danger of blowing out the flame through the pressure of the oxygen 80' shields the preheating flame, from drafts or delivered through the orifice 31, since it currents'of'ai'r induced by'the jets and flowinglongitudinally of the blow pipe. Furthermtire, this chamber serves to preheat the oxygen, thereby producing a more intense heat than possible with any other type of blowpipe with which I am familiar, with the result that I am able, with the same rate of gas consumption, to cut deeper slots in metal than with any othert form of blowpipe with ;.which I am acquainted. A leakproof joint turned on, the oxygen delivered through the 1 injector will thoroughly commingle with the combustible gas in thepassa eway 18 and the chamber 19 and will be delivered through all but one of the slots 27into the chamber 36, whence it will pass through the passageways 37 into the chamber 38. The metal will be quickly preheated and at substantially a single ,spot, after which cutting oxygen will be supplied from the chamber 4 and the passageway 3G and will operate to cut or soften the metal.

Having thus described my invention, what I claim is 1. A blow pipe of the character described comprising a head, a tip carried by said head and comprising an inner member having a (antral passageway for cutting oxy en, the said member having intermediate t e ends thereof an enlargement provided with one or more passageways for preheating oxygen and a combustible gas, an outer ti-p member surrounding the inner member and engaging the said enlargement, there being a keyway provided between such enlargement and the outer member and a key in said keyway securing said members together, and means for supplying cutting oxygen to the first men- I tioned passageway and a mixture of preheating oxygenand a combustible gas to the second passageway or passageways.

2. A blow pipe of the character described comprising a head, a tip carried by said head and comprising an inner member having a central passageway for cutting oxygen, an

outer tip member surrounding the inner member and engaging a portion thereof, there being a keyway provided between such engaging portions of said members and a key in. said keyway securing said members together, and means for supplying cutting oxygen to the first mentioned passageway and a mixture'of preheating oxygen and a com bustible gas to the second passageway or passa eways. I

3. n a blow pipe, the combination ofv a head, a tip comprising-an inner member having acentral borefoncutting oxygen and prov ded with anenlargement intermediate the ends thereof, there bein a plurality of member surroun ing the central gassageway, an outer tip ing cutting oxygen to the first mentioned passageway and a mixture of preheating oxygen and a combustible/'gasto the other 10 passageway.

. In testimony whereof, I hereunto afiix Iny signature.

Y JOHN HARRIS. 

